Sheet-metal-tube-forming machine



0. BARK.

SHEET METAL TUBE FORMING MACHINE. A

A P P L l C A T l 0 N F l L E D M A R 5 l 9 2 0.

1,365,019, Patented Jan. 11, 1921.

F/gj, 16 T M UNITED STATES PATENT OFFICE.

OTTO BARR, 0l" CHICAGO, ILLINOIS.

Specification of Letters Patent.

Patented Jan. 11, 1921.

Application inea umh 5, 1920. serial No. 363,538.

To all whom 'it may concern:

Be it known that I, O'r'ro BARR, a citizen of the United States ofAmerica, and a resident of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Im rovements inSheet-Metal-Tube-- Forming achines, of which the following is aspecification.

The main objects of this invention are to provide an' improved machinefor making sheet-metal tubing; to provide a machine having improvedmeans for forming the tubing from two sheets of metal; to provideimproved means for properly spacing apart the sheets of metal from whichthe tube is formed whereby said tube will be of the desired crosssection; to provide improved means for corrugating the tube transversely.of its length as it is formed; and to pro- -in the background beingomitted.

Fig. 4 is a similar view takenon theline .4-4 of Fig. 2.

Fig. 5 is an enlarged fragmentary detail of the intertting parts of therolls.

Fig. 6 is an enlarged sectional detail of a form of sheet-metal tubingwhich the particular modification herein shown is de' signed to produce.

Although this invention is not limited to that particular i purpose, themodification herein illustrated and described has been designed for usein the formation of tubing of the type shown in my copending appllcationSerial No. 329,394, filed Oct. 8, 1919,

,which tubing is to be used particularly for the manufacture ofradiators for cooling the circulating water used in connectlon withinternal combustion engines and the like.

In the specific embodiment herein dia-` grammatically illustrated, thedevice comprises a pairjof rolls 7 land Sand a. core member or mandrel 9arranged to form two strips of metal 10 and 11 into a sheet-metal tube12.

The rolls 7 and 8 have their peripheres shaped toprovide axiallydisposed corrugations 13 and are mounted on shafts 14 and 15 sc as to berotated at uniform speeds by sultable gearin (not shown). The' mountingof the sha s 14 and 15 is such that the peripheries of said rolls areproperly spaced rapart to coact with the core member or mandrel 9 in theshaping of the strips of metal 10 and 11 to a tube 12 of the desiredcross section. Grooves 16 and 17 are circumferentially formed in theIperiphery of the lrolls 7 and 8 respectively nearthe'ends thereof, whichgrooves are adapted to coact to form the seams in a tube, as will morefully hereinafter appear. n

The core member or mandrel 9 is of a fiexible nature being constructedfrom heavy woven cotton canvas, woven metal fabric or a combination ofthe two. As herein shown, a

strip of the flexible material is looped through a slot 18 formed in a'plate 19 ex tending rearwardly from the rolls 7 and 8 and secured to ablock or bar 20 mounted on the frame of the machine. The width and thethickness of the flexible material is made so as to give the desiredshape to the tube 12. The stri s of sheet-metal 10 and 11 are cut andshape by other means before being fed to the rlls 7 and 8. In thisparticular case, the sheet 10 has had the edges thereof curled aroundreinforcing wires 21 and then bent to provide fianges 22. The strip 11has its ed es turned so as to provide the flanges 23. uitable means areprovided for feeding the sheets 10 and 11 to the rolls 7 and 8 in such away that as said strips approach the rolls, the flanges 22 pass intoengagef yment with the flanges 23 inwardly thereof.

The operation of the machine as herein illustrated, is substantially asfollows: p

By suitable mechanism, the strips of metal 10 and 11, previously shaped,are fed to the rolls 7 and V8. As said strips approach the rolls, thepairs of flanges 22 and 23 enter into engagement as has just beenexplained, and upon entering the grooves 16 and 17 of the rolls 7 and 8,are bent over and firmly compressed togetherv to form a substantiallywater-tight seam along the edges of the tube. As thestrips pass betweenthe rolls 7l and. 8 and are seemed together, they are given aAcorrugated formation, asshown to merous details of the constructionshown maybe altered or omitted without departing from the spirit of thisinvention' as defined by the following claims.

I claim:

l. In a machine for forming flat tubing,-

the combination of a pair of opposed rolls having their perpheriesspaced apart and a stationary liexible core member arranged between saidrolls, said rolls being adapted to have fed between them on 0 positesides of said core member strips o metal having llanges formed alongtheedges thereof, said rolls having their peripheries shaped so as tocoact with said c'ore member and with each other to form said stripsinto a tube of elongated cross section wlth said flanges compressed intoseams along the edges of said tube.

2. In a machine of the class described, the combination of a pair ofrolls having their peripheries specially shaped and spaced apart and astationary flexible core member arranged between said rolls, said rollsand core member coacting to form a sheet-metal tube of predeterminedshape and cross section.

8. In a machine of the class described, the combination of a pair ofopposed rolls having their perpheries spaced apart and providedwithaxially disposed corrugations, a stationary flexible core memberarranged between ysaid rolls, said rolls being adapted to have fedbetween them on opposite sides 'of said core member sheet-metal strips,said rolls .and core member coacting to form said sheets into acorrugated sheet-metal tube of predetermined cross section.

tube properly l spaced y 4.' In a machine for forming at corrugatedltubing, the combination of a pair of rolls having the eripheries thereofspaced apart and provi ed with axially disposed corruations, to whichrolls are adapted to be fe strips of metal having flan es formed alongthe edges thereof, said ro s having theirA peripheries constructedcircumferentlally so as to coact with said corrugations of theredetermined cross section and to form said flanges into seams.

f in shaping said strips into a corrugated tube y In amachine of theclass described lthe combination of a pair of opposed-rolls havlingtheir. peripheries speclally shaped and spaced apart, a canvas coremember arranged4 between said rolls, a support arranged 'at one side ofsaid rolls in substantial alinement with the space between them andconnected to said core member, said rolls being adapted to have fedthereto on o posite sides o said core member strips o? metal havingflanges :formed along the edges thereof, said' rolls and core membercoacting to form said sheet into a sheet metal tube of predeterminedshape and cross-section, with said -ianges compressed into seams alongthe edges thereof.

6. In a machine of the class described the combination of a pairof-opposed rolls having their peripheries specially shaped and spacedapart, va` core member arranged between said rolls, a support located atone side of said rolls and a connection to said support from said coremember adapted to maintain the core member in substantially fixedalinement with a space between said rolls, said connection being somounted that the space on all sides thereof rearwardly of said rolls issubstantially unobstructed, whereby said rolls are adapted to have fedthereto on opposite sides of said core sheets of metal of substantiallyunlimited lengths, said rolls and core coacting to form said sheetsinto-a sheet-metaltube of the desired shape and cross section.

Signed at Chicago this 13th day of February 1920.

OTTO BARK.l

